I can only speculate, but the exosomes that bud off a cell carry cell organelles, proteins or cellular material that other cells will take up. Supposedly exosomes are involved in cell-to-cell communication and if one cell is lacking something, it could signal to other cells that substance X is low. Conversely, if there is a surplus of something toxic in a cell, if that toxin is trapped in an extracellular vesicle that then interacts with another cell, it could damage that other cell or signal that other cell to produce defensive chemicals like prostaglandins or eicosanoids. I wonder if exosomes can "metastasize" or transfer cancer to other non-cancerous cells, in addition to changing the cellular field/environment.
Microscopy, as how it's done nowadays, tends to inanimate, kill or "freeze" the cell in a moment in time and even the light from the microscope can supposedly affect these cellular functions. Supposedly Dark Field Microscopy is superior for observing some of these phenomena because you don't have the factor of light affecting cellular behavior.
In this video they mention that mast cells produce exosomes, and this would likely INCREASE or spread the inflammatory reaction from an allergen. It's possible this is why someone might get hives that spread when they consume an allergen.
One of the female scientists studying her PHD states she saw proteins from Cell B on Cell A indicating a transfer of proteins happened. Maybe if a cell no longer has use for a protein it can "lend" the protein to another cell?
Thanks but it does not answer my question. If the exosomes are being mistaken for so called viruses, why would they enter cells as presumably viruses can be seen doing?